Blink Support for Overlay Scrollbar Animation

Source/platform/scroll/ScrollbarStateTransitionAnimatorTest.cpp

Index: Source/platform/scroll/ScrollbarStateTransitionAnimatorTest.cpp
diff --git a/Source/platform/scroll/ScrollbarStateTransitionAnimatorTest.cpp b/Source/platform/scroll/ScrollbarStateTransitionAnimatorTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1abe3fa1492e21a1a5b3cacb74a0b4490c55f99e
--- /dev/null
+++ b/Source/platform/scroll/ScrollbarStateTransitionAnimatorTest.cpp
@@ -0,0 +1,174 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "platform/scroll/ScrollbarStateTransitionAnimator.h"
+
+#include "platform/HostWindow.h"
+#include "platform/Logging.h"
+#include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/IntRect.h"
+#include "platform/scroll/ScrollableArea.h"
+#include "platform/scroll/ScrollbarThemeOverlayMock.h"
+#include "public/platform/WebScreenInfo.h"
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+using testing::AtLeast;
+using testing::Return;
+using testing::_;
+
+namespace blink {
+
+class MockScrollbarStateTransitionAnimator : public ScrollbarStateTransitionAnimator {
+public:
+    MockScrollbarStateTransitionAnimator(ScrollableArea* scrollableArea)
+        : ScrollbarStateTransitionAnimator(scrollableArea)
+    {
+    }
+
+    void reset()
+    {
+        m_data.reset();
+        m_mockCurrentTime = 0;
+        stopAnimationTimerIfNeeded();
+    }
+
+    void setCurrentTime(double time)
+    {
+        m_mockCurrentTime = time;
+    }
+    virtual double currentTime() const OVERRIDE
+    {
+        return m_mockCurrentTime;
+    }
+
+private:
+    double m_mockCurrentTime;
+};
+
+class MockHostWindow : public HostWindow {
+public:
+    MOCK_METHOD1(invalidateContentsAndRootView, void(const IntRect&));
+    MOCK_METHOD1(invalidateContentsForSlowScroll, void(const IntRect&));
+    MOCK_CONST_METHOD1(rootViewToScreen, IntRect(const IntRect&));
+    MOCK_CONST_METHOD0(screenInfo, WebScreenInfo());
+    MOCK_METHOD0(scheduleAnimation, void());
+};
+
+class MockScrollableAreaForAnimator : public ScrollableArea {
+public:
+    MockScrollableAreaForAnimator(bool enabled)
+        : m_scrollbarAnimatorEnabled(enabled)
+    {
+    }
+
+    virtual bool hasOverlayScrollbars() const OVERRIDE
+    {
+        return m_scrollbarAnimatorEnabled;
+    }
+
+    virtual HostWindow* hostWindow() const OVERRIDE
+    {
+        return m_hostWindow;
+    }
+
+    MOCK_CONST_METHOD0(isActive, bool());
+    MOCK_CONST_METHOD1(scrollSize, int(ScrollbarOrientation));
+    MOCK_METHOD2(invalidateScrollbar, void(Scrollbar*, const IntRect&));
+    MOCK_CONST_METHOD0(isScrollCornerVisible, bool());
+    MOCK_CONST_METHOD0(scrollCornerRect, IntRect());
+    MOCK_METHOD1(setScrollOffset, void(const IntPoint&));
+    MOCK_METHOD2(invalidateScrollbarRect, void(Scrollbar*, const IntRect&));
+    MOCK_METHOD1(invalidateScrollCornerRect, void(const IntRect&));
+    MOCK_METHOD1(setScrollOffsetFromAnimation, void(const IntPoint&));
+    MOCK_CONST_METHOD0(enclosingScrollableArea, ScrollableArea*());
+    MOCK_CONST_METHOD0(minimumScrollPosition, IntPoint());
+    MOCK_CONST_METHOD0(maximumScrollPosition, IntPoint());
+    MOCK_CONST_METHOD1(visibleContentRect, IntRect(IncludeScrollbarsInRect));
+    MOCK_CONST_METHOD0(contentsSize, IntSize());
+    MOCK_CONST_METHOD0(overhangAmount, IntSize());
+    MOCK_CONST_METHOD0(scrollbarsCanBeActive, bool());
+    MOCK_CONST_METHOD0(scrollableAreaBoundingBox, IntRect());
+    MOCK_CONST_METHOD0(scrollPosition, IntPoint());
+    MOCK_CONST_METHOD0(shouldPlaceVerticalScrollbarOnLeft, bool());
+    MOCK_CONST_METHOD1(userInputScrollable, bool(ScrollbarOrientation));
+    MOCK_CONST_METHOD0(visibleHeight, int());
+    MOCK_CONST_METHOD0(visibleWidth, int());
+
+private:
+    MockHostWindow* m_hostWindow;
+    bool m_scrollbarAnimatorEnabled;
+};
+
+TEST(ScrollbarStateTransitionAnimatorEnabled, Enabled)
+{
+    MockScrollableAreaForAnimator scrollableArea(true);
+    MockScrollbarStateTransitionAnimator scrollbarAnimator(&scrollableArea);
+
+    scrollbarAnimator.reset();
+    scrollbarAnimator.setCurrentTime(1.0);
+    scrollbarAnimator.mouseEnteredScrollbar(0);
+    scrollbarAnimator.setCurrentTime(1.1);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_TRUE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    EXPECT_NE(0.f, scrollbarAnimator.stateTransitionProgress());
+    EXPECT_EQ(blink::WebThemeEngine::StateNormal, scrollbarAnimator.stateTransitionStartState());
+    EXPECT_EQ(blink::WebThemeEngine::StateHover, scrollbarAnimator.stateTransitionEndState());
+    scrollbarAnimator.setCurrentTime(2.0);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.reset();
+    scrollbarAnimator.setCurrentTime(1.0);
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.mouseExitedScrollbar(0);
+    scrollbarAnimator.setCurrentTime(1.1);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_TRUE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    EXPECT_NE(0.f, scrollbarAnimator.stateTransitionProgress());
+    EXPECT_EQ(blink::WebThemeEngine::StateHover, scrollbarAnimator.stateTransitionStartState());
+    EXPECT_EQ(blink::WebThemeEngine::StateNormal, scrollbarAnimator.stateTransitionEndState());
+    scrollbarAnimator.setCurrentTime(2.0);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.reset();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+}
+
+TEST(ScrollbarStateTransitionAnimatorEnabled, Disabled)
+{
+    MockScrollableAreaForAnimator scrollableArea(false);
+    MockScrollbarStateTransitionAnimator scrollbarAnimator(&scrollableArea);
+
+    scrollbarAnimator.reset();
+    scrollbarAnimator.setCurrentTime(1.0);
+    scrollbarAnimator.mouseEnteredScrollbar(0);
+    scrollbarAnimator.setCurrentTime(1.1);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    EXPECT_EQ(0.f, scrollbarAnimator.stateTransitionProgress());
+    EXPECT_NE(blink::WebThemeEngine::StateNormal, scrollbarAnimator.stateTransitionStartState());
+    EXPECT_NE(blink::WebThemeEngine::StateHover, scrollbarAnimator.stateTransitionEndState());
+    scrollbarAnimator.setCurrentTime(2.0);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.reset();
+    scrollbarAnimator.setCurrentTime(1.0);
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.mouseExitedScrollbar(0);
+    scrollbarAnimator.setCurrentTime(1.1);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    EXPECT_EQ(0.f, scrollbarAnimator.stateTransitionProgress());
+    EXPECT_NE(blink::WebThemeEngine::StateHover, scrollbarAnimator.stateTransitionStartState());
+    EXPECT_NE(blink::WebThemeEngine::StateNormal, scrollbarAnimator.stateTransitionEndState());
+    scrollbarAnimator.setCurrentTime(2.0);
+    scrollbarAnimator.serviceAnimations();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+    scrollbarAnimator.reset();
+    EXPECT_FALSE(scrollbarAnimator.isDuringStateTransitionAnimation());
+}
+
+} // namespace blink